国立东华大学试题 系所：资讯管理学系.ppt

2007/6/26 Final Test-1,國立東華大學試題 系所：資訊管理學系 科目：資料庫管理 第1頁/共6頁,Question 1: About B+ Tree (20%),How index are used? 有哪三項? 試以上圖解釋之。 How to get record with key = 18, and how many disk I/O are needed to get it? If we want to print out all records, at least, how many disk I/O are needed? In general, what are the advantages and disadvantages of using “index”?,2007/6/26 Final Test-2,E.g. Consider weak entity payment that depends on entity loan,Question 2: E-R Model Tables (20%),Draw a relational table for entity loan What is the primary key for your table laon? Draw a relational table for weak entity payment What is the primary key for your table payment?.,2007/6/26 Final Test-3,Question 3: Entity Sets vs. Attributes (10%),Case 1: telephone-number as an attributes Case 2: Create a entity set: telephone Discuss case 1 之優缺點 Discuss case 2 之優缺點,Consider a Entity Set: employee with attributes (employee-id, employee-name, telephone-number),2007/6/26 Final Test-4,Explain the following terms blob clob Logical database design Specialization vs. Generalization in E-R diagram UML Diagram Update Anomalies!,Question 4: Explain Terms (20%),grant on to ,EXEC SQL END-EXEC,2007/6/26 Final Test-5,When we delete a tuple in branch, eg. Brighton Broklyn 7100000, what will happen in account?,create table account (account-number char(10), branch-name char(15), balance integer, primary key (account-number), foreign key (branch-name) references branch on delete set null on update cascade ),5. account,1. branch,references,Question 5: Referential Integrity (15%),b) When we update the first tuple in branch, eg. Donghwa Broklyn 7100000, what will happen in account?,c) When we delete the first tuple in account, what will happen in branch?,2007/6/26 Final Test-6,According to your final project as “Design and implement a useful database application system” What is the title of your project? Names of members in your team. Draw the E-R Diagram of your application system. (You can just give a similar diagram.) Draw a table to show one relation used in the system Check your answer in d) to see whether it is in the 1NF? Why? Please answer “why” by using the definition of the 1NF. Same as e) to see whether it is